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<!-- INDEX BEGIN -->
<div name="index">
<p><a name="__index__"></a></p>

<ul>

	<li><a href="#name">NAME</a></li>
	<li><a href="#synopsis">SYNOPSIS</a></li>
	<li><a href="#description">DESCRIPTION</a></li>
	<li><a href="#return_values">RETURN VALUES</a></li>
	<li><a href="#conforming_to">CONFORMING TO</a></li>
	<li><a href="#see_also">SEE ALSO</a></li>
	<li><a href="#copyright">COPYRIGHT</a></li>
</ul>

<hr name="index" />
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<p>
</p>
<hr />
<h1><a name="name">NAME</a></h1>
<p>SHA1, SHA1_Init, SHA1_Update, SHA1_Final, SHA224, SHA224_Init, SHA224_Update,
SHA224_Final, SHA256, SHA256_Init, SHA256_Update, SHA256_Final, SHA384,
SHA384_Init, SHA384_Update, SHA384_Final, SHA512, SHA512_Init, SHA512_Update,
SHA512_Final - Secure Hash Algorithm</p>
<p>
</p>
<hr />
<h1><a name="synopsis">SYNOPSIS</a></h1>
<pre>
 #include &lt;openssl/sha.h&gt;</pre>
<pre>
 int SHA1_Init(SHA_CTX *c);
 int SHA1_Update(SHA_CTX *c, const void *data, size_t len);
 int SHA1_Final(unsigned char *md, SHA_CTX *c);
 unsigned char *SHA1(const unsigned char *d, size_t n,
                     unsigned char *md);</pre>
<pre>
 int SHA224_Init(SHA256_CTX *c);
 int SHA224_Update(SHA256_CTX *c, const void *data, size_t len);
 int SHA224_Final(unsigned char *md, SHA256_CTX *c);
 unsigned char *SHA224(const unsigned char *d, size_t n,
                       unsigned char *md);</pre>
<pre>
 int SHA256_Init(SHA256_CTX *c);
 int SHA256_Update(SHA256_CTX *c, const void *data, size_t len);
 int SHA256_Final(unsigned char *md, SHA256_CTX *c);
 unsigned char *SHA256(const unsigned char *d, size_t n,
                       unsigned char *md);</pre>
<pre>
 int SHA384_Init(SHA512_CTX *c);
 int SHA384_Update(SHA512_CTX *c, const void *data, size_t len);
 int SHA384_Final(unsigned char *md, SHA512_CTX *c);
 unsigned char *SHA384(const unsigned char *d, size_t n,
                       unsigned char *md);</pre>
<pre>
 int SHA512_Init(SHA512_CTX *c);
 int SHA512_Update(SHA512_CTX *c, const void *data, size_t len);
 int SHA512_Final(unsigned char *md, SHA512_CTX *c);
 unsigned char *SHA512(const unsigned char *d, size_t n,
                       unsigned char *md);</pre>
<p>
</p>
<hr />
<h1><a name="description">DESCRIPTION</a></h1>
<p>Applications should use the higher level functions
<em>EVP_DigestInit(3)</em> etc. instead of calling the hash
functions directly.</p>
<p>SHA-1 (Secure Hash Algorithm) is a cryptographic hash function with a
160 bit output.</p>
<p>SHA1() computes the SHA-1 message digest of the <strong>n</strong>
bytes at <strong>d</strong> and places it in <strong>md</strong> (which must have space for
SHA_DIGEST_LENGTH == 20 bytes of output). If <strong>md</strong> is NULL, the digest
is placed in a static array. Note: setting <strong>md</strong> to NULL is <strong>not thread safe</strong>.</p>
<p>The following functions may be used if the message is not completely
stored in memory:</p>
<p>SHA1_Init() initializes a <strong>SHA_CTX</strong> structure.</p>
<p>SHA1_Update() can be called repeatedly with chunks of the message to
be hashed (<strong>len</strong> bytes at <strong>data</strong>).</p>
<p>SHA1_Final() places the message digest in <strong>md</strong>, which must have space
for SHA_DIGEST_LENGTH == 20 bytes of output, and erases the <strong>SHA_CTX</strong>.</p>
<p>The SHA224, SHA256, SHA384 and SHA512 families of functions operate in the
same way as for the SHA1 functions. Note that SHA224 and SHA256 use a
<strong>SHA256_CTX</strong> object instead of <strong>SHA_CTX</strong>. SHA384 and SHA512 use <strong>SHA512_CTX</strong>.
The buffer <strong>md</strong> must have space for the output from the SHA variant being used
(defined by SHA224_DIGEST_LENGTH, SHA256_DIGEST_LENGTH, SHA384_DIGEST_LENGTH and
SHA512_DIGEST_LENGTH). Also note that, as for the SHA1() function above, the
SHA224(), SHA256(), SHA384() and SHA512() functions are not thread safe if
<strong>md</strong> is NULL.</p>
<p>
</p>
<hr />
<h1><a name="return_values">RETURN VALUES</a></h1>
<p>SHA1(), SHA224(), SHA256(), SHA384() and SHA512() return a pointer to the hash
value.</p>
<p>SHA1_Init(), SHA1_Update() and SHA1_Final() and equivalent SHA224, SHA256,
SHA384 and SHA512 functions return 1 for success, 0 otherwise.</p>
<p>
</p>
<hr />
<h1><a name="conforming_to">CONFORMING TO</a></h1>
<p>US Federal Information Processing Standard FIPS PUB 180-4 (Secure Hash
Standard),
ANSI X9.30</p>
<p>
</p>
<hr />
<h1><a name="see_also">SEE ALSO</a></h1>
<p><em>EVP_DigestInit(3)</em></p>
<p>
</p>
<hr />
<h1><a name="copyright">COPYRIGHT</a></h1>
<p>Copyright 2000-2020 The OpenSSL Project Authors. All Rights Reserved.</p>
<p>Licensed under the OpenSSL license (the &quot;License&quot;).  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file LICENSE in the source distribution or at
<a href="https://www.openssl.org/source/license.html">https://www.openssl.org/source/license.html</a>.</p>

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